PT-2026-2721 · Microsoft · Windows Virtualization-Based Security (Vbs) Enclave+1

Andrey Markovytch + 1 · Published 2026-01-13 · Updated 2026-01-19 · CVE-2026-20876

Positive Technologies (AI Summary)

CVSS v2.0

6.8

Medium

Base vector

AV:L/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions Windows Virtualization-Based Security (VBS) Enclave (affected versions not specified)

Description A heap-based buffer overflow exists within the Windows Virtualization-Based Security (VBS) Enclave component. This condition allows a locally authorized attacker to gain elevated privileges on the system. The issue involves a flaw that can be exploited to affect system security.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

LPE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

BDU:2026-00441

CVE-2026-20876

Affected Products

Windows

Windows Virtualization-Based Security (Vbs) Enclave

References · 8

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-20876 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-20876 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20876 · Vendor Advisory
• https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2026-20876 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-20876 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-00441 · Security Note
• https://twitter.com/CVEnew/status/2011759661418942840 · Twitter Post
• https://twitter.com/transilienceai/status/2013129539610690002 · Twitter Post